Add: Tr Ph Thảo (hpthaoo)

A B(5;1) C D E F(4;3) G d:x+2y-18=0

Gọi AF giao BC tại G. Theo ĐL Thales thì \(\frac{FA}{FG}=\frac{ED}{EB}=1\), suy ra F là trung điểm AG

Dễ thấy tam giác ABG cân tại B,do đó AG vuông góc BF

Đường thẳng AG: đi qua \(F\left(4;3\right)\), VTPT \(\overrightarrow{FB}=\left(1;-2\right)\)\(\Rightarrow AG:x-2y+2=0\)

Xét hệ \(\hept{\begin{cases}x+2y-18=0\\x-2y+2=0\end{cases}\Leftrightarrow\hept{\begin{cases}x=8\\y=5\end{cases}}\Rightarrow A\left(8;5\right)}\)

Vì F là trung điểm AG nên \(G\left(0;1\right)\)\(\Rightarrow\overrightarrow{GB}=\left(5;0\right)\)=> VTPT của BC là \(\left(0;1\right)\)

\(\Rightarrow BC:x-1=0\). Vậy \(d\left(O;BC\right)=1.\)

1 she told me that she didn't chocolate

2 she said she wouldn't see me the following day

4 she told me she had visited her parents at the weekend

1. She told me she didn’t chocolate.

2. She said she wouldn’t see me the next day.

3. She said she was living in Paris for a few months.

4. She told me she had visited her parents at the weekend.

5. She said she hadn’t eaten sushi before.

6. She said she hadn’t travelled by underground before she came to London.

7. She said they would help if they could.

8. She told me she would do the washing-up later.

9. She said she could read when she was three.

10. She said she had been sleeping when Julie called”.

Human beings have gained much specific advancement recently. There are a series of inventions that have brought human conveniences in a modern life. Television sets as a good example that certainly influences on our life in communication and entertainment. However, TV also causes some bad effects of time-consuming and health problems.In the first place, television helps people in the ways of communicating to each other and entertaining their life. Thanks to the appearance TV, people can keep up-to-date with the world. What our life will be if we do not have a TV at home. Because TV is a cheap and available tool to provide us daily information. Also, watching TV is a valuable kind of entertainment that helps people relax after working hard or suffering from a busy life. Last but not least, TV has changed husband's behavior in connecting to each other.Beside of good advantages of TV, watching TV may cause some disorders in health and working time as well. Some people spend long hours in front of a TV set, they may neglect then work or duty in taking care of their family members. And young people may work less effectively and addicted to watching TV lead to passiveness and laziness.In conclusion, everything has two sides and TV is optional. It is obvious that TV benefits our life in making people become friendly and close. I totally agree that TV is a great invention and we have to be aware of its good points by using it suitably.

Human beings have gained much specific advancement recently. There are a series of inventions that have brought human conveniences in a modern life. Television sets as a good example that certainly influences on our life in communication and entertainment. However, TV also causes some bad effects of time-consuming and health problems.

In the first place, television helps people in the ways of communicating to each other and entertaining their life. Thanks to the appearance TV, people can keep up-to-date with the world. What our life will be if we do not have a TV at home. Because TV is a cheap and available tool to provide us daily information. Also, watching TV is a valuable kind of entertainment that helps
people relax after working hard or suffering from a busy life. Last but not least, TV has changed husband's behavior in connecting to each other.

Beside of good advantages of TV, watching TV may cause some disorders in health and working time as well. Some people spend long hours in front of a TV set, they may neglect then work or duty in taking care of their family members. And young people may work less effectively and addicted to watching TV lead to passiveness and laziness.

In conclusion, everything has two sides and TV is optional. It is obvious that TV benefits our life in making people become friendly and close. I totally agree that TV is a great invention and we have to be aware of its good points by using it suitably.

Add: Tr Ph Thảo (hpthaoo)

Nghĩa đen:Đỏ

Nghĩa bóng:Son sắt,thủy chung

Nghĩa đen: vị ngon ngọt không đổi thay

Nghĩa bóng:tấm long thủy chung son sắc với cuộc đời

Chiều cao căn phòng là :

6 x 2/3 = 4(m)

Thể tích căn phòng là :

8 x 6 x 4 = 192(m³)

Trong phòng đó chứa số m³ không khí là :

192 - 7 = 185(m³)

Đ/S: 185m³ không khí

Chiều cao của phòng học là: 6*2/3=4 (m)

Thể tích phòng học là: 8*6*4=192 (cm³)

Thể tích không khí trong phòng là: 192-7=185 (cm³)

        Đáp số: 185 cm³

9 phút =  540  giây

420 giây = 7 phút

7 phút 10 giây = 430 giây

1/5​ phút = 12 giây

-Tk cho mk nha -

  - Mk cảm ơn-

Cho 50 điểm M_1,M_2,M;...;M₅₀ trên đường thẳng d và điểm O nằm ngoài đường thẳng d . vẽ các tia góc O đi qua 50 điểm đã cho . Hỏi có tất cả bao nhiêu góc đỉnh o mà các cạnh là các tia đã vẽ ở trên?